<!DOCTYPE html>
<html lang="en">

<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta http-equiv="X-UA-Compatible" content="ie=edge">
   <script src="https://cdn.bootcss.com/jquery/1.12.3/jquery.js"></script>
   <title>迭代器模式</title>
</head>

<body>
   <div>
      <p>1</p>
      <p>2</p>
      <p>3</p>
      <p>4</p>
   </div>
   
<script src="test.js"></script>
   <!-- <script src="focus.js"></script> -->
   <!-- <script src="index.js"></script>  -->
</body>

</html>